I'm sure the Aimpoint is superior to the Sparc. Is it 2-3X as good (as pricing might imply)? I highly doubt it. That's really all the info you need in my opinion. All further decisions are between you and your wallet. Spending $150-200 vs $400+ is really about your personal needs, preferences, and budget.
I have a couple Vortex red-dots. I have maybe $250 into the pair, both bought new. They're outstanding and I'm confident that they serve my needs
at least 90% as well as an Aimpoint would. Maybe someday I'll have an Aimpoint, but for now I'm pretty content with "settling" for Vortex. Regardless, do have flip-up BUIS at the ready on any rifle you intend to depend on for serious inquiries.
Very happy with my Strikefires, and currently in the market for a Sparc.